Today Got Better
Subscribe

Life Sciences & Medicine Active Updated Aug 15, 2026

A youth protein switches aging microglia back on

Mount Sinai researchers found that a protein called TIMP2 controls whether the brain's aging immune cells, microglia, slide into a sluggish, inflammatory state or keep clearing cellular debris. Deleting TIMP2 aged microglia in mice while injecting it into already-old mice reversed the effect, adding a possible molecular lever alongside the newly discovered Stanford finding that blood-derived immune cells replenish the aging human brain. The stakes are whether restoring TIMP2 could become a real intervention for age-related cognitive decline.

The story so far

  1. Aug 15, 2026 Latest

    Mount Sinai researchers found that deleting the protein TIMP2 from mouse microglia caused the cells to rapidly take on hallmarks of aging, senescence, sluggish debris clearing and heightened inflammatory signaling, while injecting TIMP2 into already-old mice reversed the effect, shifting microglia away from their pro-inflammatory state and restoring their debris-clearing function.

    Today Got Better

This story moves with the morning letter.

When this arc advances, the timeline above grows the same morning. One short, warm letter with the day's real progress in science, medicine and beyond. Free, every day.